MAXON has reversed course with the new Cinebench R20 benchmark, which is now available for standalone download directly from MAXON's website, no longer requiring the use of Microsoft's UWP platform. This author did his due diligence and has downloaded this new file, which is indeed a portable version in a ZIP file as we had been accustomed to with previous versions.
Cinebench R20, captured after running the portable download version from MAXON
Rather controversially, the new version of Cinebench was exclusive to the Microsoft Store when it was released, and Guru3D reported being threatened with legal action for hosting a standalone version for download on their site, which they took down at that time. With today's reversal the how-to guides on creating a portable version of the UWP app have, thankfully, become obsolete.